A piezoelectric device is a technology that generates an electric charge in response to mechanical stress. This effect occurs in certain materials, such as quartz and certain ceramics, which can convert physical pressure into electrical energy. These devices are commonly used in various applications, including sensors, actuators, and energy harvesting systems. When pressure is applied to a piezoelectric material, it causes a displacement of charges within the material, creating a voltage. This principle is utilized in everyday items like microphones, speakers, and watches, where they help convert sound waves into electrical signals or power small electronic components.